Ionia Weather Forecast

    • 49
    • 67

    Mostly Cloudy

    • 54
    • 65

    Rain Showers Likely

    • 50
    • 65

    Rain Showers

    • 47
    • 60

    Chance Rain Showers

    • 46
    • 60

    Chance Rain Showers

    • 48
    • 59

    Chance Rain Showers

    • 50
    • 60

    Chance Rain Showers

Today 18 Sep Ontario

Partly sunny. Highs in the mid 60s.

Tonight 18 Sep Ontario

Mostly cloudy. Lows in the upper 40s. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ionia Temperature Statistics

September Temperature

Rochester, Greater Rochester International Airport (15.5 miles)

  • Lowest 15 September, 2026

    47.6 °F

  • Average September

    68.1 °F

  • Highest 2 September, 2026

    85.6 °F

Climate (2021–2026)

Rochester, Greater Rochester International Airport (15.5 miles)

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  • Average Low 2021–2026

    42.2 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.5 °F
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